This plan on the surface appeared fairly practicable if the action could be carried on with sufficient rapidity to prevent the enemy from gathering in his crowds, as he had gathered at Colenso. Here was the great--If. The art of war is at best a choice of difficulties, and at this time our Generals had an embarrassment of that choice. It says a great deal for their courage that they handled these difficulties one after another, and let go only when they thought they had been squeezed dry. The British troops having done with the fatigue of the march, did not allow the grass to grow under their feet. No sooner had they crossed the river than they began to threaten some of the Boer lines of retreat to the Free State. The Naval Brigade also set to work with vigour, and they, together with the howitzers from Mount Alice, pounded the whole vicinity to the right impartially. The range having been ascertained to a nicety, with the assistance of the balloon, whose occupants directed the gunners, some effective shots were launched at the Boer entrenchments, and others which were rapidly in course of construction. From the balloon these were plainly visible, but their tenants, if tenants there were, vouchsafed no reply. Many mounted Boers were seen galloping from Colenso to their laagers in the shelter of the more northerly kopjes, while others were also discovered coming in the direction from Ladysmith, evidently with a view to reinforce the commandoes on Spion Kop. While the Naval Brigade was hammering in the direction of the Boer position, which was somewhat below the level of Mount Alice, General Lyttleton was moving north of the position for the purpose of making a demonstration towards Brakfontein, and Sir Charles Warren's force was approaching two high kopjes overlooking a ravine behind Spion Hill. It was now the 18th of January. The cavalry started in advance of the rest of the force. The order of march being, first, the Composite Regiment (one squadron of Imperial Light Horse, sixty Rifles Mounted Infantry, one squadron Natal Carabineers), four squadrons South African Light Horse, Thorneycroft's Mounted Infantry, and behind these the Royals and 13th Hussars. But the Composite Regiment at midday was found to have moved still farther west, and soon from that region came an ominous crackling. Something deadly was afoot. It appeared that a party of Boers was caught trekking by the Acton Homes Road towards the Free State, and was in act of being cut off. Firing was fast and furious, and presently dead and dying Boers besprinkled the field that a few moments before had been green and gracious to the eye. A message was sent to the main body demanding reinforcements. Promptly Lord Dundonald with the rest of his troops came on the scene. Hostilities grew in animation--the situation was desperate. The Boers made a hard fight of it, clung tenaciously to their position, refusing, though surrounded, to surrender.